PEG Modified Tungsten Trioxide Film

PEG is abbreviation of polyethylene glycol. Can be used to improve the electrochromic properties of tungsten trioxide films. PEG-modified tungsten trioxide electrochromic films prepared by sol-gel method have obvious improvements in the optical properties and cyclic voltammetry of the bleached state.

PEG modified tungsten trioxide film has good electrochromic properties. 5000 cycles of tungsten trioxide electrochromic reaction, the voltammetry curve no significant attenuation. At the same time its maximum transmittance of visible light modulation ranges up to 71%. The addition of PEG changed the microstructure of the tungsten trioxide film to form mesoporous with an average diameter of 9 nm, which increased the diffusion rate of ions in it and thus improved the electrochromic properties of the tungsten trioxide film. Due to the importance of cyclic stability to the practical application of electrochromic materials, this low-cost wet-chemical method is expected to be used to prepare high-performance tungsten trioxide-based electrochromic devices.

The addition of PEG and subsequent heat treatment plays a crucial role in the change of the film structure. Compared with ordinary tungsten trioxide film, PEG modified tungsten trioxide film has excellent cycle stability. This is because the addition of PEG formed mesoporous in the tungsten trioxide film with an average size of 9 nm. The mesoporous help to improve the diffusion and migration of lithium ions in the film, enhance the electrochromic reversibility of the film, shorten the color / fading response time, and improve the optical modulation amplitude and the coloring efficiency of the film in the visible light band.

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